Steam-engine valve-gear



H. D. GLIDDEN,A v STEAM ENGINE vALvE GgAR.

APPLICATION FILED APR. l2. IQIB.

Patented Dee. 9,' 1919.

IIIII lllIllllllllllllllllllllllll "lm qmnlruvl f1. D. Glidden l Jw/ S )M attozucd unirsi) srnrns Parana envien.

HARRY D. GLIDDEN, OF WAVERLY, IOWA, ASSIGNORF NE-THIRD TO `A. J'. SCHWARTZ AND ,ONE-THIRD To e. E. noGGENsAcK, Born/or wAvnnLY, Iowa.

STEAM-ENGINE vALvn-GEAR i A .Application filed April 12, 1918. Serial ITO. 228,188.

To all whom t may concern: Y

Be it known that I, HARRY D. GLIDDEN,

a citizen :of the United States, residing at Waverly, in the county of Bremer, State of Iowa, have invented a new and'useful Steam- Y Engine Valve-Gear; and I do hereby declare the following to be a full, clear7 and exact description of the invention, such as will enable others skilled in the art to which it appertainsto make and use the same.

The present invention relates to a steam engine valve gear, and has for its object to provide a no-vel mechanism for transmitting motion from the crank of a drive wheel of a steam locomotive to the distributing valve which admits steam to the cylinder, said mechanism providing for an accurate timin or reversing of the actionV of the ,distri uting valve and being at all times under the perfect control ofthe operator.

Further objects of the invention are to provide a device of this character which does not necessitate the use of complicated and delicate connections and bearings, and which is accordingly well adapted to withstand the rough usage to which such devices are subjected when installed upon railroad rolling stock, which can be used in connection with the conventional distributing valve mechanism employed upon locomotives, and which can be easily and quickly operated to reverse the action of the distributing valve at any time.

With these and other objects in view, the invention consists in certain novel combinations and arrangements of the parts as will more fully appear as the description proceeds, the novel features thereof being pointed lout in the appended claim.

For a full understanding of the invention, reference is to be had to the following description and accompanying drawings, in which Figure l is a side elevation of a fragmentary portion of a locomotive, showing the valve gear mechanism mounted thereon.

Fig. 2 isa top plan view thereof.

Fig. 3 is a transverse sectional view.

Fig. et is a vertical longitudinal sectional view through the reversing shaft and radius shaft, showing a portion of the locomotive frame upon which the reversing shaft is v mounted.

Corres ondino' and like arts are referred Speccation of Letters Patent.

VPatented Dee. 9, 19179.4

cated in all the views of the drawings by the same reference characters. Referring to the drawings, which illustrate one embodiment of the invention, the numerals l designate a pair of conventional locomotive drive wheels which are mounted upon'an axle 2, portions ofthe side bars of the. locomotive frame being indicated at 3.V

rlhe main cra-nk i of each of the. drive wheels is provided with a'rigidly connected auxiliary crank 5 which stands 90 forward of the main crank. rlhe usual `pitman 6 is connected to the mainy crank 4, while an auxiliary pitman 7 is connected at one end thereof to a wrist pin 8 at the end of the auxiliary crank 5. It will be noted'thatthe annular path of thewris't pinS, which vis indicated by the dotted lines 9, is Vsmaller than the annular path of the main crank 4, as .indicated bythe dotted lines l0. The .usual cross head guide bars are shown at l1, said bars being .secured at their ends to a yoke 19. which is provided at its upper portion with a bracket 13 upon which a bell crank lever 11i is pivotally mounted at 15. o

One arm of the bell crank lever 1li is pivotally connected at 16 to the valve stem 17 of a conventional distributing valve. The other arm of the bell crank lever 14 is loosely connected by a downwardly extend'- ing link 17 to the free end of the auxiliary pitman 7. The two auxiliary pitmen 7 are pivotally connected at points spaced from the free ends thereof, by means of suitable pins 1S, to the lower ends of radius hangers i9. The upper ends of the hangers 1-9 are loose upon a radius shaft 20 which extends vtransversely acrossV the locomotive and is supported by radius arms 21. The upper ends of these radius arms 21 are provided with sleeves 22 which receive the radius shaft, set screws 23 being employed to obtain a rigid connection between thegsaid members. The lower ends of the radius arms 21 are provided with sleeves 24 which are keyed upon a reversing shaft 25, said shaft extending transversely across `the frame of the locomotive and .having the exn tremities thereof journaled in bearings 26 which are suitably secured to the side bars 3 of the locomotive frame. A

The radius shaft 20 is connected by a link 27 to a reversing lever 2S which is located at some convenient point upon the locomotive. It will bel obvious that by manipulating this lever 2S the radius shaft 2O can be moved back and forth in the are of a circle about the reversing shaft 25 as a center. This movement of the radius shaft is indicated by dotted lines on Fig; l. vVhen the engine is in operation it will be apparent that the auxiliary pitmen 7 will oscillate about the pivot pins 18 at the loiver ends `of the radius hangers 19, and that the said pins 18 will also oscillate back and forth about the radius shaft 2O as a center. When the positioning of this radius shaft 2O is shifted, the arcuate path of the pivot pin is changed, and in this manner the operation of the steam distributing valve can be timed in the desired manner relative to the movements of the drive Wheel. A lull movement of the reversing lever 28 will operate to reverse the action or' the distributing valve and reverse the engine. This valve gear is free from delicate and complicated parts. and has nothing to break or get out or adjustment, even when subjected to rough usage.

Having thus described the invention, what I claim as :ue-W and desire to secure by Letters Patent, is:-

In a valve gear for railway locomotives, the combination with the main frame, pitman and crank shaft, of an auxiliary crank set at an angle to the main crank, an auX- pitman, bearings at opposite sides of the i locomotive frame, a reversing shaft extending transversely across the locomotive frame and journaled in the bearings, a transversely disposed radius shaft arranged above the reversing shaft and extending across the locomotive frame in a parallel relation to the radius shaft, radius arms pivotally connecting the reversing shaft and radius shaft and supporting the latter, an upright radius hanger pivotally connecting the radius shaft to an intermediate portion of the auxiliary pitman, and a reversing lever operatively connected to the radius shaft for swinging the same about the reversing shaft as a center to regulate the operation of the steam distributing valve.

In testimony whereof I have Vsigned my name to this speciication in the presence of tivo subscribing witnesses. V

HARRY DGLIDDEN.

Witnesses:

WV. H. l/VEHRMACHER, MAYME BUoHN-ER. 

